“Being confident in the vaccine and deciding to get vaccinated — those need to be voluntary, personal decisions,” said Elisabeth Wilhelm, a vaccine confidence strategist with the Centers for Disease Control and Prevention. “We ask people to think very, very carefully when they talk about incentives, whether it’s a bag of rice for your kid getting vaccinated in Nigeria or getting a coronavirus vaccine in your workplace in the United States. It is a lever that can be used — it just should not be the first that you pull on.”